单项选择题

[听力原文]6-8
M: Number, please
M: Oh, I’d like to make a transferred charge call.
W: Where to, sir
M: Northfield, Minnesota.
W. What number
M: 456 - 582 - 8642.
W: Whom are you calling
M: John Walker.
W: May I have your name
M: Shawn Young.
W: How do you spell your last name, please
M: Y-o-u-n-g.
W: And where are you calling from
M: 984 - 654 - 8893, Portland.
W: Thank you, sir. Hold the line, please. I’ll put you through.

What is the probable relationship between the man and woman()

A.Boss and secretary.
B.Friends.
C.Caller and operator.
D.Customer and house agent.